双指示剂法测混合碱时,以酚酞为指示剂时用去 HCl 标准溶液 V 1 ml ,以甲基橙作指示剂时用去 HCl 标准溶液 V 2 ml ,若 V 1 >V 2 ,则该混合碱为
A.
Na 2 CO 3 +NaHCO 3
B.
Na 2 CO 3 +NaOH
C.
NaHCO 3 +NaOH
D.
NaOH+Na 2 CO 3 +NaHCO 3
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